\omit-ing a specific type of Script [globally or via edition-engraver]

[Kieren MacMillan]

Hi all,

Given

\version "2.21"
{ \omit Script c''1^\fermata_\espressivo }

obviously both Script grobs will be omitted; same, of course, with

\version "2.21"
\layout { \context { \Score \omit Script } }
{ c''1^\fermata_\espressivo }

Is there a way (e.g., via callback or improved \omit function definition) to 
make \omit more surgical? For example, can one effectively say

    \omit #'(fermata) Script

so that only fermatas get omitted?

Thanks,
Kieren.